Mathematical calculating device



' oct. 12, 1937-. z c s 4 2,095,943

MATHEMATICAL CALCULATING DEVICE Filed Jan. 10, 1936 15 illustrating itsapplication.

Patented Oct. 12, 1937 MATHEMATICAL CALCULATING Jennie R. Zaohs,Hartford, Application January 10, 1936, Serial No.

2 Claims.

My invention relates to that class which In One form of a. deviceembodying my invention and use of which the obects herein set out, aswell as others,

drawing in which c Figure 1 is a face view of my improved calculatingdevice.

Figure 2 is a. view of a portion of the device Figure 3 shows a fragmentof trating its application.

Figure 4 is a view similar to Figure 3 illustrating the device inanother position.

In the solution of algebraic the device illus- Some lines may if desiredbe extensions of the graduations along the edge of the ruler.

At a lines, that is, at the corners of certain squares, I

as follows. To solve graphically the equations 3m-4y plus 20 equals and2x plus 11 plus 6 equals 0 we proceed as follows: First we lay out on aplain piece point or points of the intersection of these I nsvrcn Conn..I

to draw a line I! through the two pencil points made on the :v and yaxes and as shown in Figure 4.

The values of a: and

y in the second equation having been found to be relatively if desired,at the corners oi other in squares on said piece, and a perforationthrough the piece at the corner of a square.

2. A mathematical calculating device including a piece or transparentmaterial, lines displayed in squares on said piece, said lines beingalternately light and heavy, and a perforation through 4 said piece atthe corner of a square.

JENNIE a. zacns.

